// Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// which accompanies this distribution, and is available

// at the URL "http://www.eclipse.org/legal/epl-v10.html".

//

// Initial Contributors:

// Nokia Corporation - initial contribution.

//

// Contributors:

//

// Description:

// @file

// 

//

#include <aprulebased.h>

#include <aplaunchchecker.h>

#include "APFSTD.H" // Panics etc.

void CleanUpEComInfoArray(TAny* aInfoArray);

// CApaRuleBasedDll

/** The rule-based framework. Mantain all rule-based plug-ins available in the system */

class CApaRuleBasedDll : public CBase

	{

public:

	CApaRuleBasedDll();

	~CApaRuleBasedDll(); // closes lib and deletes next

public:

	enum TPresence { ENotPresent, EIsPresent };

	inline TPresence Present() const { return iPresent; }

	inline void Present(TPresence aPresence) { iPresent = aPresence; }

	inline TUid Uid() const { return iUid; }

	inline void Uid(TUid aUid) { iUid = aUid; }

	inline CAppLaunchChecker* LaunchChecker() { return iLaunchChecker; }

	inline void LaunchChecker(CAppLaunchChecker* aLaunchChecker) { iLaunchChecker = aLaunchChecker; }

private:

	TPresence iPresent;

	TUid iUid;

	CAppLaunchChecker* iLaunchChecker; // pointer to plug-in implementation

	};

CApaRuleBasedDll::CApaRuleBasedDll()

	{

	}

CApaRuleBasedDll::~CApaRuleBasedDll()

	{

	delete iLaunchChecker;

	}

/** The function provides access to launch checker interface by index */

EXPORT_C CAppLaunchChecker* CApaScanningRuleBasedPlugIns::operator[](TInt aIndex) const

	{

	return iRuleBasedLib[aIndex]->LaunchChecker();

	} 

EXPORT_C CApaScanningRuleBasedPlugIns* CApaScanningRuleBasedPlugIns::NewL()

	{

	CApaScanningRuleBasedPlugIns* self = new(ELeave) CApaScanningRuleBasedPlugIns();

	CleanupStack::PushL(self);

	self -> ScanForRuleBasedPlugInsL();

	CleanupStack::Pop(self);

	return self;

	}

EXPORT_C CApaScanningRuleBasedPlugIns::~CApaScanningRuleBasedPlugIns()

	{

	iRuleBasedLib.ResetAndDestroy();

	}

/** The function loads the ecom rule-based plug-ins */

void CApaScanningRuleBasedPlugIns::LoadEcomRuleBasedPlugInL(TUid aUid)

	{

	// check we haven't loaded this one already

	for(TInt index = 0; index < iRuleBasedLib.Count(); index++)

		{

		CApaRuleBasedDll* lib = iRuleBasedLib[index];

		if (lib->Uid() == aUid)

			{// already found

			lib -> Present(CApaRuleBasedDll::EIsPresent);

			return;

			}			

		}

	// load the library

	CApaRuleBasedDll* lib = new(ELeave) CApaRuleBasedDll();

	CleanupStack::PushL(lib);

	TRAPD(error, lib -> LaunchChecker(CAppLaunchChecker::NewL(aUid)));

	if((error == KErrNone) && lib -> LaunchChecker())

		{

		lib->Present(CApaRuleBasedDll::EIsPresent);

		lib->Uid(aUid);

		// add lib to the library list

		iRuleBasedLib.Append(lib);

		CleanupStack::Pop(lib);

		}

	else 

		{

		CleanupStack::PopAndDestroy(lib);

		}

	}

/** The function scans and initializes all rule-based plug-ins available in the system */

EXPORT_C void CApaScanningRuleBasedPlugIns::ScanForRuleBasedPlugInsL()

	{

	// set all rule based plug-ins to not present - pending rediscoivery

	TInt index;

	for (index = 0; index < iRuleBasedLib.Count(); index++)

		{

		CApaRuleBasedDll* rule = iRuleBasedLib[index];

		rule -> Present(CApaRuleBasedDll::ENotPresent);

		}

	//scan ecom plugin

	RImplInfoPtrArray implementationArray;

	TCleanupItem cleanup(CleanUpEComInfoArray, &implementationArray);

	CleanupStack::PushL(cleanup);

	REComSession::ListImplementationsL(KUidRuleBasedInterfaceUid, implementationArray);

	const TInt availCount = implementationArray.Count();

	for (TInt count = 0; count < availCount; ++count)

		{

		const CImplementationInformation* info = implementationArray[count];

		TUid uid = info -> ImplementationUid();

		LoadEcomRuleBasedPlugInL(uid);

		}

	CleanupStack::PopAndDestroy(&implementationArray);

	// remove any rule based plug-ins that are no longer present

	index = 0;

	while (index < iRuleBasedLib.Count())

		{

		CApaRuleBasedDll* rule = iRuleBasedLib[index];

		if (rule -> Present() == CApaRuleBasedDll::ENotPresent)

			{

			iRuleBasedLib.Remove(index);

			delete rule;

			}

		else

			{

			index++;

			}

		}

	}

/** The function returns number of plug-ins available in the system*/

EXPORT_C  TInt CApaScanningRuleBasedPlugIns::ImplementationCount() const

	{

	return iRuleBasedLib.Count();

	}